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/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id$ */
package org.apache.fop.fo.pagination;
// Avalon
import org.apache.avalon.framework.logger.AbstractLogEnabled;
/**
* This class uses the 'format', 'groupingSeparator', 'groupingSize',
* and 'letterValue' properties on fo:page-sequence to return a String
* corresponding to the supplied integer page number.
*/
public class PageNumberGenerator extends AbstractLogEnabled {
private String format;
private char groupingSeparator;
private int groupingSize;
private int letterValue;
// constants
private static final int DECIMAL = 1; // '0*1'
private static final int LOWERALPHA = 2; // 'a'
private static final int UPPERALPHA = 3; // 'A'
private static final int LOWERROMAN = 4; // 'i'
private static final int UPPERROMAN = 5; // 'I'
// flags
private int formatType = DECIMAL;
private int minPadding = 0; // for decimal formats
// preloaded strings of zeros
private String zeros[] = {
"", "0", "00", "000", "0000", "00000"
};
/**
* Main constructor. For further information on the parameters see the XSLT
* specs (Number to String Conversion Attributes).
* @param format format for the page number
* @param groupingSeparator grouping separator
* @param groupingSize grouping size
* @param letterValue letter value
*/
public PageNumberGenerator(String format, char groupingSeparator,
int groupingSize, int letterValue) {
this.format = format;
this.groupingSeparator = groupingSeparator;
this.groupingSize = groupingSize;
this.letterValue = letterValue;
// the only accepted format strings are currently '0*1' 'a', 'A', 'i'
// and 'I'
int fmtLen = format.length();
if (fmtLen == 1) {
if (format.equals("1")) {
formatType = DECIMAL;
minPadding = 0;
} else if (format.equals("a")) {
formatType = LOWERALPHA;
} else if (format.equals("A")) {
formatType = UPPERALPHA;
} else if (format.equals("i")) {
formatType = LOWERROMAN;
} else if (format.equals("I")) {
formatType = UPPERROMAN;
} else {
// token not handled
//getLogger().debug("'format' token not recognized; using '1'");
formatType = DECIMAL;
minPadding = 0;
}
} else {
// only accepted token is '0+1'at this stage. Because of the
// wonderful regular expression support in Java, we will resort to a
// loop
for (int i = 0; i < fmtLen - 1; i++) {
if (format.charAt(i) != '0') {
//getLogger().debug("'format' token not recognized; using '1'");
formatType = DECIMAL;
minPadding = 0;
} else {
minPadding = fmtLen - 1;
}
}
}
}
/**
* Formats a page number.
* @param number page number to format
* @return the formatted page number as a String
*/
public String makeFormattedPageNumber(int number) {
String pn = null;
if (formatType == DECIMAL) {
pn = Integer.toString(number);
if (minPadding >= pn.length()) {
int nz = minPadding - pn.length() + 1;
pn = zeros[nz] + pn;
}
} else if ((formatType == LOWERROMAN) || (formatType == UPPERROMAN)) {
pn = makeRoman(number);
if (formatType == UPPERROMAN) {
pn = pn.toUpperCase();
}
} else {
// alphabetic
pn = makeAlpha(number);
if (formatType == UPPERALPHA) {
pn = pn.toUpperCase();
}
}
return pn;
}
private String makeRoman(int num) {
int arabic[] = {
1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1
};
String roman[] = {
"m", "cm", "d", "cd", "c", "xc", "l", "xl", "x", "ix", "v", "iv",
"i"
};
int i = 0;
StringBuffer romanNumber = new StringBuffer();
while (num > 0) {
while (num >= arabic[i]) {
num = num - arabic[i];
romanNumber.append(roman[i]);
}
i = i + 1;
}
return romanNumber.toString();
}
private String makeAlpha(int num) {
String letters = "abcdefghijklmnopqrstuvwxyz";
StringBuffer alphaNumber = new StringBuffer();
int base = 26;
int rem = 0;
num--;
if (num < base) {
alphaNumber.append(letters.charAt(num));
} else {
while (num >= base) {
rem = num % base;
alphaNumber.append(letters.charAt(rem));
num = num / base;
}
alphaNumber.append(letters.charAt(num - 1));
}
return alphaNumber.reverse().toString();
}
}
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